Modeling of Field Distribution and Energy Storage in Diphasic Dielectrics
Modeling of electrostatic field distribution and energy storage in diphasic dielectrics containing high-permittivity BaTiO3 in a glass host has been carried out using analytical modeling based on the Maxwell Garnett (MG) mixing rule, and numerical simulations accomplished using boundary element method (BEM) method software. The field distribution was studied as a function of the dielectric contrasts and volume fractions of the phases. For the geometry with a high-permittivity sphere enclosed in a low-permittivity glass cube it was found that a dielectric contrast of 75 and volume fraction of 46.8% led to higher energy storage densities than other geometries. For composites with lower volume fractions of high-permittivity inclusions, field enhancement factors of 2.6 were observed, whereas for higher volume fraction composites, field enhancements of 10 were noted. Higher field enhancement factors are expected to lead to dielectric breakdown at lower applied fields, limiting energy density. The upper limit of applicability of the MG formulation in terms of the inclusion volume fraction was also established and is a function of dielectric contrast. The host material permittivity causes a substantial variation in the applicability limit of the MG mixing rule, while the permittivity of inclusion phase does not affect the limit.
S. K. Patil et al., "Modeling of Field Distribution and Energy Storage in Diphasic Dielectrics," Proceedings of the 2006 IEEE Symposium on the Applications of Ferroelectrics (2006, Sunset Beach, NC), Institute of Electrical and Electronics Engineers (IEEE), Aug 2006.
The definitive version is available at http://dx.doi.org/10.1109/ISAF.2006.4387893
2006 IEEE Symposium on the Applications of Ferroelectrics (2006: Jul.-Aug. 3, Sunset Beach, NC)
Electrical and Computer Engineering
Materials Science and Engineering
United States. Office of Naval Research
Keywords and Phrases
Dielectric Composites; Electric Field Distribution; Energy Storage
Article - Conference proceedings
© 2006 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.